<template>
  <div class="type-nav">
            <div class="container">
                <div @mouseleave="showLeave">
                        <h2 class="all" @mouseenter="changeShow" >全部商品分类</h2>
                        <transition name="sort">
                            <div class="sort" v-show="show">
                        <div class="all-sort-list2" @click="gosearch">
                            <div class="item" v-for="(c1,index) in categoryList" :key="c1.categoryId" @mouseenter="changeId(index)">
                                <h3 :class="{show:categoryId==index}">
                                    <a :data-categoryName="c1.categoryName" :data-category1Id="c1.categoryId">{{c1.categoryName}}</a>
                                </h3>
                                <!-- 判断获取当前鼠标滑过的位置  并控制样式展示 -->
                                <div class="item-list clearfix" :style ="{display:(categoryId==index)?'block':'none'}">
                                    <div class="subitem"  v-for="(c2,index) in c1.categoryChild" :key="c2.categoryId">
                                        <dl class="fore">
                                            <dt>
                                                <a :data-categoryName="c2.categoryName" :data-category2Id="c2.categoryId">{{c2.categoryName}}</a>
                                            </dt>
                                            <dd>
                                                <em v-for="(c3,index) in c2.categoryChild" :key="c3.categoryId">
                                                    <a :data-categoryName="c3.categoryName" :data-category3Id="c3.categoryId">{{c3.categoryName}}</a>
                                                </em>
                                            </dd>
                                        </dl>
                                    </div>
                                </div>
                            </div>
                        </div>
                            </div>
                        </transition>
                </div>
                <nav class="nav">
                    <a href="###">服装城</a>
                    <a href="###">美妆馆</a>
                    <a href="###">尚品汇超市</a>
                    <a href="###">全球购</a>
                    <a href="###">闪购</a>
                    <a href="###">团购</a>
                    <a href="###">有趣</a>
                    <a href="###">秒杀</a>
                </nav>
                
            </div>
    </div>
</template>

<script>
import throttle from "lodash/throttle"
import {mapState} from 'vuex'
  export default {
    name:'',
    data(){
        return{
            categoryId:'',
            show:true
        }
    },
    computed:{
        // 把vuex仓库里面的东西取出来
        ...mapState({
            categoryList:state=>state.home.categoryList
        })
    },
    methods:{
        // 采用节流的方式解决浏览器反应不过来的现象

        changeId:throttle(function(index){
           this.categoryId = index 
        },20),
        gosearch(event){
            let nodeElement = event.target;
            // 获取自定义属性dataset 获取自定义属性
           let {categoryname,category1id,category2id,category3id} = nodeElement.dataset
        //    判断点击的是不是a标签  通过自定属性的catagoryName 是否存在
           if(categoryname){
               let location = {name:"search"};
               let query = {categoryName:categoryname};
            //    根据是否存在属性category1id 与具体传入的值没有关系
               if(category1id){
                   query.category1Id = category1id
               }else if(category2id){
                   query.category2Id = category2id
               }else{
                   query.category3Id = category3id
               }
               location.query = query;
               location.params = this.$route.parmas;
            //    发送编程式路由
               if(this.$route.path != "/home"){
                this.$router.replace(location)
            }else{
                this.$router.push(location);
            }
           }
        },
        changeShow(){
            if(this.$route.path != '/home'){
                this.show = true
            }
        },
        showLeave(){
            this.categoryId=-1
            if(this.$route.path != '/home'){
                this.show = false
            }
        }
    },
    // 加载的时候通过路由判断出来是哪个路由页面
    mounted(){
        if(this.$route.path != '/home'){
            this.show = false
        }
    }
  }
</script>

<style scoped lang="less">
   .type-nav {
        border-bottom: 2px solid #e1251b;

        .container {
            width: 1200px;
            margin: 0 auto;
            display: flex;
            position: relative;

            .all {
                width: 210px;
                height: 45px;
                background-color: #e1251b;
                line-height: 45px;
                text-align: center;
                color: #fff;
                font-size: 14px;
                font-weight: bold;
            }

            .nav {
                a {
                    height: 45px;
                    margin: 0 22px;
                    line-height: 45px;
                    font-size: 16px;
                    color: #333;
                }
            }

            .sort {
                position: absolute;
                left: 0;
                top: 45px;
                width: 210px;
                height: 461px;
                position: absolute;
                background: #fafafa;
                z-index: 999;

                .all-sort-list2 {
                    .item {
                        h3 {
                            line-height: 30px;
                            font-size: 14px;
                            font-weight: 400;
                            overflow: hidden;
                            padding: 0 20px;
                            margin: 0;

                            a {
                                color: #333;
                            }
                            &.show{
                                background: rgb(79, 115, 168);
                            }
                        }

                        .item-list {
                            display: none;
                            position: absolute;
                            width: 734px;
                            min-height: 460px;
                            background: #f7f7f7;
                            left: 210px;
                            border: 1px solid #ddd;
                            top: 0;
                            z-index: 9999 !important;

                            .subitem {
                                float: left;
                                width: 650px;
                                padding: 0 4px 0 8px;

                                dl {
                                    border-top: 1px solid #eee;
                                    padding: 6px 0;
                                    overflow: hidden;
                                    zoom: 1;

                                    &.fore {
                                        border-top: 0;
                                    }

                                    dt {
                                        float: left;
                                        width: 54px;
                                        line-height: 22px;
                                        text-align: right;
                                        padding: 3px 6px 0 0;
                                        font-weight: 700;
                                    }

                                    dd {
                                        float: left;
                                        width: 415px;
                                        padding: 3px 0 0;
                                        overflow: hidden;

                                        em {
                                            float: left;
                                            height: 14px;
                                            line-height: 14px;
                                            padding: 0 8px;
                                            margin-top: 5px;
                                            border-left: 1px solid #ccc;
                                        }
                                    }
                                }
                            }
                        }

                        // &:hover {
                        //     .item-list {
                        //         display: block;
                        //     }
                        // }
                    }
                }
            }
            .sort-enter{
                height:0px;
                transform: rotate(0deg);
            }
            .sort-enter-to{
                height:461px;
                transform:rotate(360deg);
            }
            .sort-enter-active{
                transition:all .2s;
            }
        }
    }
</style>
